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Linux/drivers/pci/hotplug/pciehp_core.c

  1 /*
  2  * PCI Express Hot Plug Controller Driver
  3  *
  4  * Copyright (C) 1995,2001 Compaq Computer Corporation
  5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
  6  * Copyright (C) 2001 IBM Corp.
  7  * Copyright (C) 2003-2004 Intel Corporation
  8  *
  9  * All rights reserved.
 10  *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License as published by
 13  * the Free Software Foundation; either version 2 of the License, or (at
 14  * your option) any later version.
 15  *
 16  * This program is distributed in the hope that it will be useful, but
 17  * WITHOUT ANY WARRANTY; without even the implied warranty of
 18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 19  * NON INFRINGEMENT.  See the GNU General Public License for more
 20  * details.
 21  *
 22  * You should have received a copy of the GNU General Public License
 23  * along with this program; if not, write to the Free Software
 24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 25  *
 26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
 27  *
 28  */
 29 
 30 #include <linux/module.h>
 31 #include <linux/moduleparam.h>
 32 #include <linux/kernel.h>
 33 #include <linux/slab.h>
 34 #include <linux/types.h>
 35 #include <linux/pci.h>
 36 #include "pciehp.h"
 37 #include <linux/interrupt.h>
 38 #include <linux/time.h>
 39 
 40 /* Global variables */
 41 bool pciehp_debug;
 42 bool pciehp_poll_mode;
 43 int pciehp_poll_time;
 44 static bool pciehp_force;
 45 
 46 #define DRIVER_VERSION  "0.4"
 47 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
 48 #define DRIVER_DESC     "PCI Express Hot Plug Controller Driver"
 49 
 50 MODULE_AUTHOR(DRIVER_AUTHOR);
 51 MODULE_DESCRIPTION(DRIVER_DESC);
 52 MODULE_LICENSE("GPL");
 53 
 54 module_param(pciehp_debug, bool, 0644);
 55 module_param(pciehp_poll_mode, bool, 0644);
 56 module_param(pciehp_poll_time, int, 0644);
 57 module_param(pciehp_force, bool, 0644);
 58 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
 59 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
 60 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
 61 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing");
 62 
 63 #define PCIE_MODULE_NAME "pciehp"
 64 
 65 static int set_attention_status (struct hotplug_slot *slot, u8 value);
 66 static int enable_slot          (struct hotplug_slot *slot);
 67 static int disable_slot         (struct hotplug_slot *slot);
 68 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
 69 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
 70 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
 71 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
 72 static int reset_slot           (struct hotplug_slot *slot, int probe);
 73 
 74 /**
 75  * release_slot - free up the memory used by a slot
 76  * @hotplug_slot: slot to free
 77  */
 78 static void release_slot(struct hotplug_slot *hotplug_slot)
 79 {
 80         struct slot *slot = hotplug_slot->private;
 81 
 82         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 83                  __func__, hotplug_slot_name(hotplug_slot));
 84 
 85         kfree(hotplug_slot->ops);
 86         kfree(hotplug_slot->info);
 87         kfree(hotplug_slot);
 88 }
 89 
 90 static int init_slot(struct controller *ctrl)
 91 {
 92         struct slot *slot = ctrl->slot;
 93         struct hotplug_slot *hotplug = NULL;
 94         struct hotplug_slot_info *info = NULL;
 95         struct hotplug_slot_ops *ops = NULL;
 96         char name[SLOT_NAME_SIZE];
 97         int retval = -ENOMEM;
 98 
 99         hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
100         if (!hotplug)
101                 goto out;
102 
103         info = kzalloc(sizeof(*info), GFP_KERNEL);
104         if (!info)
105                 goto out;
106 
107         /* Setup hotplug slot ops */
108         ops = kzalloc(sizeof(*ops), GFP_KERNEL);
109         if (!ops)
110                 goto out;
111         ops->enable_slot = enable_slot;
112         ops->disable_slot = disable_slot;
113         ops->get_power_status = get_power_status;
114         ops->get_adapter_status = get_adapter_status;
115         ops->reset_slot = reset_slot;
116         if (MRL_SENS(ctrl))
117                 ops->get_latch_status = get_latch_status;
118         if (ATTN_LED(ctrl)) {
119                 ops->get_attention_status = get_attention_status;
120                 ops->set_attention_status = set_attention_status;
121         }
122 
123         /* register this slot with the hotplug pci core */
124         hotplug->info = info;
125         hotplug->private = slot;
126         hotplug->release = &release_slot;
127         hotplug->ops = ops;
128         slot->hotplug_slot = hotplug;
129         snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
130 
131         ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:00 sun=%x\n",
132                  pci_domain_nr(ctrl->pcie->port->subordinate),
133                  ctrl->pcie->port->subordinate->number, PSN(ctrl));
134         retval = pci_hp_register(hotplug,
135                                  ctrl->pcie->port->subordinate, 0, name);
136         if (retval)
137                 ctrl_err(ctrl,
138                          "pci_hp_register failed with error %d\n", retval);
139 out:
140         if (retval) {
141                 kfree(ops);
142                 kfree(info);
143                 kfree(hotplug);
144         }
145         return retval;
146 }
147 
148 static void cleanup_slot(struct controller *ctrl)
149 {
150         pci_hp_deregister(ctrl->slot->hotplug_slot);
151 }
152 
153 /*
154  * set_attention_status - Turns the Amber LED for a slot on, off or blink
155  */
156 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
157 {
158         struct slot *slot = hotplug_slot->private;
159 
160         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
161                   __func__, slot_name(slot));
162 
163         pciehp_set_attention_status(slot, status);
164         return 0;
165 }
166 
167 
168 static int enable_slot(struct hotplug_slot *hotplug_slot)
169 {
170         struct slot *slot = hotplug_slot->private;
171 
172         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
173                  __func__, slot_name(slot));
174 
175         return pciehp_sysfs_enable_slot(slot);
176 }
177 
178 
179 static int disable_slot(struct hotplug_slot *hotplug_slot)
180 {
181         struct slot *slot = hotplug_slot->private;
182 
183         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
184                   __func__, slot_name(slot));
185 
186         return pciehp_sysfs_disable_slot(slot);
187 }
188 
189 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
190 {
191         struct slot *slot = hotplug_slot->private;
192 
193         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
194                   __func__, slot_name(slot));
195 
196         pciehp_get_power_status(slot, value);
197         return 0;
198 }
199 
200 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
201 {
202         struct slot *slot = hotplug_slot->private;
203 
204         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
205                   __func__, slot_name(slot));
206 
207         pciehp_get_attention_status(slot, value);
208         return 0;
209 }
210 
211 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
212 {
213         struct slot *slot = hotplug_slot->private;
214 
215         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
216                  __func__, slot_name(slot));
217 
218         pciehp_get_latch_status(slot, value);
219         return 0;
220 }
221 
222 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
223 {
224         struct slot *slot = hotplug_slot->private;
225 
226         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
227                  __func__, slot_name(slot));
228 
229         pciehp_get_adapter_status(slot, value);
230         return 0;
231 }
232 
233 static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
234 {
235         struct slot *slot = hotplug_slot->private;
236 
237         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
238                  __func__, slot_name(slot));
239 
240         return pciehp_reset_slot(slot, probe);
241 }
242 
243 static int pciehp_probe(struct pcie_device *dev)
244 {
245         int rc;
246         struct controller *ctrl;
247         struct slot *slot;
248         u8 occupied, poweron;
249 
250         if (pciehp_force)
251                 dev_info(&dev->device,
252                          "Bypassing BIOS check for pciehp use on %s\n",
253                          pci_name(dev->port));
254         else if (pciehp_acpi_slot_detection_check(dev->port))
255                 goto err_out_none;
256 
257         ctrl = pcie_init(dev);
258         if (!ctrl) {
259                 dev_err(&dev->device, "Controller initialization failed\n");
260                 goto err_out_none;
261         }
262         set_service_data(dev, ctrl);
263 
264         /* Setup the slot information structures */
265         rc = init_slot(ctrl);
266         if (rc) {
267                 if (rc == -EBUSY)
268                         ctrl_warn(ctrl, "Slot already registered by another "
269                                   "hotplug driver\n");
270                 else
271                         ctrl_err(ctrl, "Slot initialization failed\n");
272                 goto err_out_release_ctlr;
273         }
274 
275         /* Enable events after we have setup the data structures */
276         rc = pcie_init_notification(ctrl);
277         if (rc) {
278                 ctrl_err(ctrl, "Notification initialization failed\n");
279                 goto err_out_free_ctrl_slot;
280         }
281 
282         /* Check if slot is occupied */
283         slot = ctrl->slot;
284         pciehp_get_adapter_status(slot, &occupied);
285         pciehp_get_power_status(slot, &poweron);
286         if (occupied && pciehp_force)
287                 pciehp_enable_slot(slot);
288         /* If empty slot's power status is on, turn power off */
289         if (!occupied && poweron && POWER_CTRL(ctrl))
290                 pciehp_power_off_slot(slot);
291 
292         return 0;
293 
294 err_out_free_ctrl_slot:
295         cleanup_slot(ctrl);
296 err_out_release_ctlr:
297         pciehp_release_ctrl(ctrl);
298 err_out_none:
299         return -ENODEV;
300 }
301 
302 static void pciehp_remove(struct pcie_device *dev)
303 {
304         struct controller *ctrl = get_service_data(dev);
305 
306         cleanup_slot(ctrl);
307         pciehp_release_ctrl(ctrl);
308 }
309 
310 #ifdef CONFIG_PM
311 static int pciehp_suspend (struct pcie_device *dev)
312 {
313         return 0;
314 }
315 
316 static int pciehp_resume (struct pcie_device *dev)
317 {
318         struct controller *ctrl;
319         struct slot *slot;
320         u8 status;
321 
322         ctrl = get_service_data(dev);
323 
324         /* reinitialize the chipset's event detection logic */
325         pcie_enable_notification(ctrl);
326 
327         slot = ctrl->slot;
328 
329         /* Check if slot is occupied */
330         pciehp_get_adapter_status(slot, &status);
331         if (status)
332                 pciehp_enable_slot(slot);
333         else
334                 pciehp_disable_slot(slot);
335         return 0;
336 }
337 #endif /* PM */
338 
339 static struct pcie_port_service_driver hpdriver_portdrv = {
340         .name           = PCIE_MODULE_NAME,
341         .port_type      = PCIE_ANY_PORT,
342         .service        = PCIE_PORT_SERVICE_HP,
343 
344         .probe          = pciehp_probe,
345         .remove         = pciehp_remove,
346 
347 #ifdef  CONFIG_PM
348         .suspend        = pciehp_suspend,
349         .resume         = pciehp_resume,
350 #endif  /* PM */
351 };
352 
353 static int __init pcied_init(void)
354 {
355         int retval = 0;
356 
357         pciehp_firmware_init();
358         retval = pcie_port_service_register(&hpdriver_portdrv);
359         dbg("pcie_port_service_register = %d\n", retval);
360         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
361         if (retval)
362                 dbg("Failure to register service\n");
363 
364         return retval;
365 }
366 
367 static void __exit pcied_cleanup(void)
368 {
369         dbg("unload_pciehpd()\n");
370         pcie_port_service_unregister(&hpdriver_portdrv);
371         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
372 }
373 
374 module_init(pcied_init);
375 module_exit(pcied_cleanup);
376 

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